another?

There are actually all of these other Javascript linq libraries, also:

linqjs.codeplex.com

jslinq.codeplex.com

javascriptiqueryable.codeplex.com

fromjs.codeplex.com

jlinq.codeplex.com

And those are just what's on codeplex.com--there may be more on sites like github.com and sourceforge.net.

Was yet another Javascript linq library warranted? Maybe. Maybe, not. If nothing else, this project can be seen as an alternate approach to implementing LINQ in Javascript, that is probably different, in at least some ways, from the project
at jsinq.codeplex.com (and all of the others).